by Kastro
Paper/Archive/CVE-2026-89086

CVE-2026-89086

OCaml jose — In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and…

EPSS 0.3%public exploitCVSS 9.1
critical.is priorityof 100
41
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 20.1.201 × 204.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.

Affected

ProductAffectedFixed inSource
jose< 0.11.00.11.0CNA

Scores by source

mitre (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879erefosv.dev/vulnerability/OSEC-2026-19